docker-mailserver/target/bin/addalias

#! /bin/bash

# shellcheck source=../bin-helper.sh
. /usr/local/bin/bin-helper.sh

DATABASE=${DATABASE:-/tmp/docker-mailserver/postfix-virtual.cf}

EMAIL="${1}"
RECIPIENT="${2}"

function usage  { echo "Usage: addalias <alias@domain> <recipient@other>" ; }

[[ -z ${EMAIL} ]] && { usage ; errex "Error: No alias specified" ; }
[[ -z ${RECIPIENT} ]] && { usage ; errex "Error: No recipient specified" ; }

grep \
  -qi "^$(escape "${EMAIL}")[a-zA-Z@.\ ]*$(escape "${RECIPIENT}")" \
  "${DATABASE}" 2>/dev/null && errex "Alias \"${EMAIL} ${RECIPIENT}\" already exists"

if grep -qi "^$(escape "${EMAIL}")" "${DATABASE}" 2>/dev/null
then
  sed -i "/${EMAIL}/s/$/,${RECIPIENT}/" "${DATABASE}"
else
  echo "${EMAIL} ${RECIPIENT}" >> "${DATABASE}"
fi